Miki,
To start off, I have not noticed any slow downs while using a system loaded
with tboot. I don't really know of any reason a slowdown would occur, but
perhaps one of the other people on this list can offer suggestions from a
lower level. As far as I am aware, once tboot puts the measurements into
the pcr and hands off to the OS kernel, its role is complete.
Can you offer some specifics on your problem? Do you mean overall machine
performance in the OS is subjectively "slower"? Are you talking about boot
speed? Perhaps some more objective performance benchmarks before/after
tboot installation would help show your problem. If you disable the
TPM/TXT, do you still notice a slow down?
-Charles
On Wed, Oct 16, 2013 at 8:48 AM, Khan <koolflash@...> wrote:
> Hi,
>
> I installed Tboot and it works fine. But one thing I noticed that my
> machine is annoyingly slow to work with. Is it normal or its just the case
> for my machine?
>
> thanks & best,
> Miki
>
>
> ------------------------------------------------------------------------------
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> the latest Intel processors and coprocessors. See abstracts and register >
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> _______________________________________________
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> tboot-devel@...
> https://lists.sourceforge.net/lists/listinfo/tboot-devel
>
>

tboot runs a mini-guest on each CPU that it sees. If your kernel sees fewer
CPUs (because of NR_CPUS or maxcpus), it will only send IPIs to the CPUs it
sees, thereby kicking them out of the mini-guest. The remaining CPUs will
spin busy-waiting in the mini-guest. If you have hyperthreading enabled
this can mean you have a mini-guest running on a "hyper-twin".
Note: this assumes you're NOT using monitor/mwait to wake up APs by setting
ap_wake_mwait to true at the tboot command line.
On Wed, Oct 16, 2013 at 5:48 AM, Khan <koolflash@...> wrote:
> Hi,
>
> I installed Tboot and it works fine. But one thing I noticed that my
> machine is annoyingly slow to work with. Is it normal or its just the case
> for my machine?
>
> thanks & best,
> Miki
>
>
> ------------------------------------------------------------------------------
> October Webinars: Code for Performance
> Free Intel webinars can help you accelerate application performance.
> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most
> from
> the latest Intel processors and coprocessors. See abstracts and register >
> http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk
> _______________________________________________
> tboot-devel mailing list
> tboot-devel@...
> https://lists.sourceforge.net/lists/listinfo/tboot-devel
>
>

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